I did some digging to see if I could find some obsolete pcm connectors and found that www.mouser.com and www.jameco.com tend to keep some, but not all in stock. They are much cheaper from these sources, but have to ordered piece by piece, so I figured a diagram with part numbers would help.
The name of the manufacturer has changed over the years. Delco has become Delphi, which has now become Aptiv.
The Micropack connectors are for the P4 GM ECMs.
pcm connector diagram.jpg
The 100W sealed Micropack are for the finned PCMs with the aluminum body. Like this picture shows:
pcm connector ID.png
Here is the PDF file with the diagrams, part numbers, and mating parts.
http://www.powerandsignal.com/docs/Catalog/Micro_Pack_Series_Section.pdf
Hope this helps, since replacement connectors are priced far too high, even on ebay.
In some cases, you may have to order the wrong connector end piece, and grind off the locating rib on it to make it fit.
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